engine runs rough for about 2 minutes after starting eitherwarmed up or cold have no check engine warning what could be causing this ?

Asked by tomtoo Sep 15, 2007 at 09:39 AM about the 1999 Chevrolet Silverado 1500 LS Extended Cab RWD

Question type: Maintenance & Repair

This problem has been ongoing for 3 years, I have a new fuel pump and the pressure is good. The truck isnt throttle responsive till it clears its throat and that takes about 2 blocks or a warm up of about a minute ir two. It backfires when trying to drive off immediatly after starting.

2 Answers
84,385

littlehorn answered 17 years ago

Sounds like either the Idle Speed Controller/Idle Air Control, Mass Airflow sensor, or intake air temperature sensor may be causing your stumbling problems until the vehicle heats up.

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handyalhere answered 8 years ago

I would try two things that are cheap. 1 change your plugs ( I use E3 plugs, 2 run injector cleaner give it a strong dose.

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